The two festivals will take over Logan Circle with hundreds of exhibitors, three stages of live entertainment, food and so much more. (Left photos courtesy Science Festival, right photos courtesy Book Festival)

Two giant festivals collide this Saturday to take over the Benjamin Franklin Parkway for a street fair and carnival unlike any other.

The Philadelphia Book Festival Street Fair and Philadelphia Science Festival Carnival are back with a packed line-up of live entertainment on three stages, science experiments, games, food and more. Check out our handy guide to the festivities, below.

Plus, the Science Festival is packing plenty of eats, with the following food trucks: Chewy’s, Hub Bub Coffee Truck, Lil Dan’s, Say Cheese, Sugar Philly and Sweet Box. And inside the Franklin Institute, there will be a Kitchen Science area in Franklin Hall with Liquid Nitrogen Ice Cream, Cupcake Chemistry and more.

Sister Cities Park

Be one of the very first to take a tour of the brand new Sister Cities Park at Logan Square, transformed into a richly planted, well-illuminated and overall welcoming civic space for people of all ages. The renovations include a new café, an active, educational play garden for kids and a boat pond.

The park doesn’t officially open until May 10, but during the carnival the Center City District will be leading tours through the space and the Science Festival will be hosting Science Cafes at the park from 11:30 a.m.-3:30 p.m.

Philadelphia Book Festival Programming

• Montgomery Auditorium: Head inside the library for an afternoon of lively talks from celebrated authors, like bestselling science writer Dava Sobel on revolutionary astronomer Copernicus; a discussion of whale science, history and policy with D. Graham Burnett; and a talk with Jonathan Haidt, award-winning psychologist and bestselling author of The Righteous Mind.

• Booksellers: Books (tons and tons of them) are clearly the focus here, from national independent sellers to neighborhood shops to individual authors to major publishing houses. Pick up new and used books, chat with agents/editors/publishers/writers and more.